Author: wudejian

I. Problem Description: When punching a 4.0mm hole in a 9mm iron bar, an SKH51 punch breaks after just over 100 punches. What material should be used? Question from a live stream viewer: When punching 4.0mm holes in a 9mm-diameter iron bar (round bar), I’m currently using SKH51 high-speed steel punches, but they don’t last long—the…

Today I took the blame again—twice, in fact. Both complaints were related to the 8566, but it wasn’t my 8566 that was being complained about; a punch manufacturer had counterfeited my 8566, and the customers filed complaints against me.  Both of these customers had used my 8566 as a punch and were very satisfied with…

Mr. Huang asked: “This punch is used to punch out these slotted gaskets (1.0 thick, 201 grade), with a slot width of 1.1. It frequently breaks off. What type of die steel should be used for this punch?”  After further discussion, we learned that the punch is made of LD die steel. Previously, it could punch…

Today, the sun is shining brightly in Dongguan, and we received two shipments. One truck arrived in the morning and another in the afternoon; unloading was very easy thanks to the clear weather. Yuhui mold steel—every piece is a large forging, six-sided and produced using a three-forging, three-drawing process.  Forging is the third major strengthening…

If you buy a counterfeit 8566, not only will it fail to solve your mold chipping problem, but it will also lead you to misjudge the chip-resistant properties of 8566 die steel.  It’s like taking counterfeit medicine—it doesn’t cure your illness, yet you blame the medicine for being ineffective.  Mr. Cao has a lettering specialist…

Mr. Zheng asked，“What type of die steel is best for cell phone heat sinks? We’re cold-extruding 6063 aluminum heat sinks, and the teeth are prone to scoring. We’re currently using H13, but after producing about 20,000 units with a single die, scoring occurs.”  The cold extrusion dies for this type of aluminum heat sink feature narrow-edged,…

Today’s most valuable order came from an aluminum extrusion plant that placed a repeat order for high-toughness LG die steel, indicating that they have resolved the fracture issues with their fine-tooth cutters.  Mr. Li’s aluminum profile molds operate at a constant temperature of 500–530°C. Currently, he uses H13 steel, but the fine teeth are prone to…

The factors that determine the performance of die steel are alloy composition, smelting quality, and heat treatment processes. These three elements form a three-legged stool—each supports the others. The absence of any one of them will affect the performance of the die steel and its service life.  However, many people do not see it this way; they…

Higher hardness isn’t always better for hot forging dies; in some cases, excessive hardness can actually accelerate cracking. A netizen used “Fake 8566”—a low-grade, deep-pit product for hot forging 45 steel costing 160 yuan per kilogram—and after just a few hundred strikes, the die cracked at the opening. They asked me: What die steel should be…

8566 anti-cracking steel is not only widely copied in the mold industry, but also in the cutting tool industry. （8566 die steel）  The day before yesterday, while on a business trip, I received a call from Mr. Lin on the highway. Mr. Lin is a cutting tool user who operates a wood chipper in Huaiyang.…

For single-step precision punching of steel, especially products with teeth, you must use 8566 anti-chipping steel; otherwise, the punch will chip so badly you’ll start questioning your life choices. Mr. Zhang came to consult with me yesterday. He’s precision punching 4mm-thick pickled sheet metal, and the product features many small serrations. He’s tried SKH9, SKH51,…